Category:Server

  • Memory leak detection and performance analysis using Valgrind tool under Linux (Reprint)

    Time:2021-1-21

    Valgrind is usually used to analyze program performance and memory leak errors A brief introduction of Valgrind Toolset Valgrind includes the following tools: 1. MemCheck: check the memory problems in the program, such as leakage, out of bounds, illegal pointer, etc. 2. Callprint: check the running time and calling procedure of program code, and analyze […]

  • On line project configuration of Linux system cluster architecture (3)

    Time:2021-1-21

    On line project configuration of Linux system cluster architecture (1) On line project configuration of Linux Cluster Architecture (2) The configuration operations of distribution file management, front-end reverse proxy and management background server were introduced in the front. Today, the configuration operations of front-end load and app server (users and businesses), official website and FTP […]

  • How to understand cryptography hidden in Web

    Time:2021-1-21

    preface How to ensure the security of password transmission / storage when developing website login function? I believe many front-end and back-end friends will be asked similar questions during the interview. When I know nothing about cryptography, I will only answer:“MD5Encryption. “ We don’t know, cryptography in the network seven layer model, evenwebThere are more […]

  • QJM of hadoop2 ha scheme

    Time:2021-1-21

    Like a person, can do anything for TA, get not accept but still willing to saddle up, waiting for the glimmer of hope. Yes, this is the spare tire, which is hung on the back of the car. It may not be used in a lifetime. In most cases, it will be hung there silently, […]

  • Mandatory command line tools for MAC (1)

    Time:2021-1-21

    Mandatory command line tools for MAC (1) As a command-line enthusiast, MAC terminalterminalIt’s really love in my heart. All kinds of command-line tools should not be too cool. Under certain circumstances, productivity takes off directly. Here are a few command line tools that I use almost every day. tldr TOO LONG ,DON’T READ。 The first […]

  • Wall crack recommended! This network investigation tool, can be called artifact!

    Time:2021-1-21

    MTR is a very useful network analysis tool. I believe many people have used it, because it is often used in personal work to analyze the network situation, and it is very simple and practical. Today, brother migrant workers will introduce and recommend it to you. 1. Introduction to MTR MTR is a very good […]

  • Implementation of remote access control in CentOS 7.4

    Time:2021-1-21

    1、 SSH Remote Management SSH is a secure channel protocol, which is mainly used to realize remote login, remote replication and other functions of character interface. SSH protocol encrypts the data transmission of both sides of communication, including the user password entered when the user logs in. Compared with early applications such as telent, RSH, […]

  • Theoretical analysis of cache architecture

    Time:2021-1-21

    Background of the problem On the design of server cacheThe article says that caching is not necessary because the database itself uses memory. But the reality is that caching is standard for large websites. Although experience shows that RDBMS only needs 0-1ms to respond at the fastest speed, which is no less than special cache,But […]

  • Multithreaded FTP tools, 10 super easy to use and free multithreaded FTP tools, Chinese version.

    Time:2021-1-21

    Multithreading FTP tool There are many kinds of free FTP tools, and each has its own characteristics. Which FTP tool is easy to use? Xiaobian thinks that radish and cabbage have their own love, depending on their personal preferences, combined with the needs of server and various functions. One of my favorite is the IIS7 […]

  • Installation and deployment of CentOS 7

    Time:2021-1-21

    1、 Installation and configuration of virtual software virtual machine(virtual machine) refers to a complete computer system with complete hardware system functions simulated by software and running in a completely isolated environment. All the work that can be done in the real computer can be realized in the virtual machine. When creating a virtual machine in […]

  • Install docker for CentOS

    Time:2021-1-20

    Environment: Linux centos8 4.18.0-80.el8.x86_ 64、docker-19.03.5 1. Preconditions Requires OS kernel 3.10+ Uname – R // view the operating system version number 2. Check if it is installed (uninstalled) yum remove docker \ docker-client \ docker-client-latest \ docker-common \ docker-latest \ docker-latest-logrotate \ docker-logrotate \ docker-engine You can also uninstall in the following ways: *Yum list […]

  • Flame graph: Linux performance analysis from a global perspective

    Time:2021-1-20

    Background In our daily work, we will receive a lot of warning mail about high CPU utilization, and encounter some service failureThe CPU is fullAt this time, we need to see what process is taking up the CPU resources of the server. Usually we passtopperhapshtopTo quickly view the process that occupies the highest CPU, as […]